P.S. As -current is essentially running the latest master branch commit it should be evident that FreeBSD will be unstable, liable to break at any point and may have horrible bugs.

So -current is good for experimentation but probably not too much more than that (unless you're Netflix with team of FreeBSD experts who famously like to run -current -- see https://news.ycombinator.com/item?id=47322830 ).